3,549 research outputs found
Waiting for Dead Men’s Shoes:Origins and Development of the U.S. Navy’s OfficerPersonnel System, 1793–1941
Donald Chisholm has provided us with an important book. It is the first comprehensive history of the development of the U.S. Navy’s officer personnel system. Others have provided portions of the picture; Christopher McKee’s A Gentlemanly and Honorable Profession: The Creation of the U.S. Naval Officer Corps, 1794–1815 is an excellent treatment of the early years. But the Royal Navy, from which many American practices derive, is more thoroughly covered
An Informal Summary of a New Formalism for Classifying Spin-Orbit Systems Using Tools Distilled from the Theory of Bundles
We give an informal summary of ongoing work which uses tools distilled from
the theory of fibre bundles to classify and connect invariant fields associated
with spin motion in storage rings. We mention four major theorems. One ties
invariant fields with the notion of normal form, the second allows comparison
of different invariant fields and the two others tie the existence of invariant
fields to the existence of certain invariant sets. We explain how the theorems
apply to the spin dynamics of spin- and spin- particles. Our approach
elegantly unifies the spin-vector dynamics from the T-BMT equation with the
spin-tensor dynamics and other dynamics and suggests an avenue for addressing
the question of the existence of the invariant spin field.Comment: Based on a presentation at Spin2014, The 21st International Symposium
on Spin Physics, Beijing, China, October 2014. To be published in the
International Journal of Modern Physics, Conference Serie
A New and Unifying Approach to Spin Dynamics and Beam Polarization in Storage Rings
With this paper we extend our studies [1] on polarized beams by distilling
tools from the theory of principal bundles. Four major theorems are presented,
one which ties invariant fields with the notion of normal form, one which
allows one to compare different invariant fields, and two that relate the
existence of invariant fields to the existence of certain invariant sets and
relations between them. We then apply the theory to the dynamics of spin-1/2
and spin-1 particles and their density matrices describing statistically the
particle-spin content of bunches. Our approach thus unifies the spin-vector
dynamics from the T-BMT equation with the spin-tensor dynamics and other
dynamics. This unifying aspect of our approach relates the examples elegantly
and uncovers relations between the various underlying dynamical systems in a
transparent way
A detailed and unified treatment of spin-orbit systems using tools distilled from the theory of bundles
We return to our study \cite{BEH} of invariant spin fields and spin tunes for
polarized beams in storage rings but in contrast to the continuous-time
treatment in \cite{BEH}, we now employ a discrete-time formalism, beginning
with the maps of the continuous time formalism. We then
substantially extend our toolset and generalize the notions of invariant spin
field and invariant frame field. We revisit some old theorems and prove several
theorems believed to be new. In particular we study two transformation rules,
one of them known and the other new, where the former turns out to be an
-gauge transformation rule. We then apply the theory to the dynamics of
spin- and spin- particle bunches and their density matrix functions,
describing semiclassically the particle-spin content of bunches. Our approach
thus unifies the spin-vector dynamics from the T-BMT equation with the
spin-tensor dynamics and other dynamics. This unifying aspect of our approach
relates the examples elegantly and uncovers relations between the various
underlying dynamical systems in a transparent way. As in \cite{BEH}, the
particle motion is integrable but we now allow for nonlinear particle motion on
each torus. Since this work is inspired by notions from the theory of bundles,
we also provide insight into the underlying bundle-theoretic aspects of the
well-established concepts of invariant spin field, spin tune and invariant
frame field. Since we neglect, as is usual, the Stern-Gerlach force, the
underlying principal bundle is of product formso that we can present the theory
in a fashion which does not use bundle theory. Nevertheless we occasionally
mention the bundle-theoretic meaningof our concepts and we also mention the
similarities with the geometrical approach to Yang-Mills Theory
Tenet two: Commit to student learning as a primary focus
https://scholarworks.wm.edu/educationbookchapters/1007/thumbnail.jp
Letter from the Editor: Development as a Pillar of Oracle
Development as a Pillar of Oracle
James P. Barber, Ph.D.
March 202
Fraternities and Sororities: Developing a Compelling Case for Relevance in Higher Education
With over 60 collective years of serving the fraternal movement as fraternity/sorority members, chapter advisors, fraternity/sorority life advisors, and (inter)national fraternal leaders, we approached writing about the experiences of college students who participate in fraternities and sororities from an affirming and positive perspective. We believe these distinctive and intergenerational organizations can provide a forum for college students to create meaningful, well-rounded, and learning-oriented experiences. Deep and long-standing challenges continue to exist, but the juxtaposition of the best and worst actions of today\u27s college students make fraternities and sororities among the most complex organizations on college campuses. In addition, there is a high level of interaction between and among students, the campus community, administrators, faculty, alumni, and external stakeholders such as parents and (inter)national fraternity/sorority headquarters. Such dynamic experiences can create shared and distinctive realities for students that are integral to student development. This chapter provides insight into the historical and modern-day complexities that affect students\u27 experiences in fraternities and sororities and offers a framework for working with this population across contexts.https://scholarworks.wm.edu/asbookchapters/1113/thumbnail.jp
The Nixon Doctrine & The Navy
Most people understand that the Nixon Doctrine involves a lowering of the U.S. profile throughout the world and further, places some limitations on our willingness to intervene overseas. The author is not nearly so confident that there is widespread understanding of some of its other implications and believes that it would be a mistake to view the Nixon Doctrine as an arbitrary decision by a single administration. On the contrary, the Nixon Doctrine seems to have been dictated by the course of world events
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